1.A sesquiterpene acid and flavonoids from Polygonum viscosum.
Datta BK1, Datta SK, Rashid MA, Nash RJ, Sarker SD. Phytochemistry. 2000 May;54(2):201-5.
4-Isobutyl-6-methyl-5-oxo-3a,4,5,7a-tetrahydro-1H-inden-13-oic acid (named viscosumic acid) and quercetin 3-O-(6"-feruloyl)-beta-D-galactopyranoside, and the known 3',5-dihydroxy-3,4',5',7-tetramethoxyflavone have been isolated from Polygonum viscosum. The structures of these isolates were determined primarily on the basis of extensive 1D and 2D NMR spectral analyses, notably, 13C PENDANT, COSY45, TOCSY, GOESY, NOESY, HMQC and HMBC.
2.Coumarins and flavonoid from Murraya paniculata (L.) Jack: Antibacterial and anti-inflammation activity.
Rodanant P1, Khetkam P2, Suksamrarn A2, Kuvatanasuchati J3. Pak J Pharm Sci. 2015 Nov;28(6):1947-51.
The ethyl acetate extract of leaves of Murraya paniculata (L.) Jack was described in the previous in vitro study on the inhibition effect on the growth of periodontopathic bacteria and the reduction of cytokines from LPS-stimulated macrophages. In this study, four coumarins including murrangatin (1), murrangatin acetate (2), murranganonesenecionate (3), micropubescin (4) and one flavonoid, 3', 4', 5', 7-tetramethoxyflavone (5) were isolated from the leaves of ethyl acetate extract of M. paniculata. MTT assay was used to test cytotoxicity on human gingival fibroblast and monocytes. The isolated compounds were evaluated for their antibacterial effect against Porphyromonas gingivalis (ATCC33277) and anti-inflammation on lipopolysaccharide-stimulated inflammation using monocyte cells. All isolated compounds exhibited antibacterial activity against P. gingivalis (ATCC 33277). Murranganonesenecionate (3) was highly potent anti-inflammation properties.
3.Pyrano chalcones and a flavone from Neoraputia magnifica and their Trypanosoma cruzi glycosomal glyceraldehyde-3-phosphate dehydrogenase-inhibitory activities.
Tomazela DM1, Pupo MT, Passador EA, da Silva MF, Vieira PC, Fernandes JB, Fo ER, Oliva G, Pirani JR. Phytochemistry. 2000 Nov;55(6):643-51.
The fruits of Neoraptua magnifica var. magnifica afforded three new flavonoids: 2'-hydroxy-4,4',-dimethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, 2'-hydroxy-3,4,4'-trimethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, and 3',4'-methylenedioxy-5,7-dimethoxyflavone which were identified on the basis of spectroscopic methods. The known flavonoids 2'-hydroxy-3,4,4',5-tetramethoxy-5',6'-(2'',2''-dimethylpyrano)chalcone, 2'-hydroxy-3,4,4',5,6'-pentamethoxychalcone, 3',4'-methylenedioxy-5,6,7-trimethoxyflavone, 3',4'-methylenedioxy-5',5,6,7-tetramethoxyflavone, 3',4',5',5,7-pentamethoxyflavanone and 3',4',5'5,7-pentamethoxyflavone were also identified. The latter flavone was the most active as glyceraldehyde-3-phosphate dehydrogenase-inhibitor.
4.Antitumor activity of flavones isolated from Artemisia argyi.
Seo JM1, Kang HM, Son KH, Kim JH, Lee CW, Kim HM, Chang SI, Kwon BM. Planta Med. 2003 Mar;69(3):218-22.
The flavones 5,6-dihydroxy-7,3',4'-trimethoxyflavone ( 1), 5,6,4'-trihydroxy-7,3'-dimethoxyflavone ( 2), 5-hydroxy-3',4',6,7-tetramethoxyflavone, 5,7,3'-trihydroxy-6,4',5'-trimethoxyflavone, ladanein, and hispidulin were isolated from the methanolic extracts of the aerial parts of Artemisia argyi and structures of the compounds were elucidated on the basis of their spectral data. These flavones inhibited farnesyl protein transferase with IC 50 values of 25 - 200 microg/mL. Compound 2 inhibited proliferation of a couple of tumor cell lines and also inhibited neovascularization in a chick chorioallantoic membrane assay. Without loss of body weight of nude mice, compounds 1 and 2 inhibited growth of a colon tumor (SW620) by 44.6 % and 14.6 %, respectively.